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Phase noise resisting amplitude and phase combined shift keying modulation/demodulation method

A technology of phase noise and key modulation, applied in phase modulation carrier systems, digital transmission systems, electrical components, etc., can solve problems such as blanks, and achieve the effect of low complexity and high reliability

Inactive Publication Date: 2011-05-11
TSINGHUA UNIV
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Problems solved by technology

However, in the current literature, the research work on this bit mapping method is almost blank

Method used

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  • Phase noise resisting amplitude and phase combined shift keying modulation/demodulation method
  • Phase noise resisting amplitude and phase combined shift keying modulation/demodulation method
  • Phase noise resisting amplitude and phase combined shift keying modulation/demodulation method

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Embodiment Construction

[0053] The anti-phase noise high-order APSK modulation and demodulation scheme design method proposed by the present invention mainly consists of four parts, which are circular constellation diagram construction, circular constellation diagram selection, demodulation algorithm and bit mapping algorithm. For the 64-point modulation method, the design of each part is described in detail as follows:

[0054] 1. Construction method of 64-point circular constellation diagram

[0055] We hope that the circular constellation diagram not only performs well under phase noise, but also guarantees its bit error performance under Gaussian white noise. So the steps we follow are to first construct circular constellations with good performance under Gaussian white noise, and then select structures with high robustness and high performance under phase noise from these circular constellations according to the constellation selection method described below. For Gaussian white noise, some lite...

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Abstract

An anti-phase noise amplitude phase combined keying modulation and demodulation method belongs to the technical field of modulation and demodulation, the method is characterized in that, a circular constellation diagram construction method and a circular constellation diagram selection method are firstly utilized for designing the constellation diagram structure with good symbol error performance; secondly, a bit mapping algorithm which is proposed by the invention is utilized for solving the difficulty in carrying out the Gray-code mapping for other constellation diagrams except for the quadrature amplitude modulation (QAM), thereby ensuring the bit error performance of the proposal; the demodulation proposal with high reliability and low complexity is further matched for use, the actualbit error performance not only is far better than the QAM which uses the Gray codes under the phase noise, but also has no obvious loss compared with the Gray-code QAM under only consideration of Gaussian white noise; finally, the design method which is proposed by the invention is simple and easy to operate, thereby being easily expanding to any order, facilitating the application in a communication system with serious phase noise of global digital broadcasting and the like and possibly reducing the costs and the complexity of a receiver at the same time of ensuring the symbol error performance of the system.

Description

technical field [0001] The invention relates to a specific design method of an anti-phase noise amplitude-phase joint keying (APSK) modulation and demodulation scheme, including signal constellation diagram construction, constellation diagram selection, demodulation algorithm and bit mapping algorithm. The bit error performance of the modulation and demodulation scheme designed by this method is not only much better than the quadrature amplitude modulation (QAM) using the Gray code in the phase noise, but also compared with the Gray code when only Gaussian white noise is considered. There is no obvious loss compared with the QAM. Moreover, the demodulation complexity of the solution is low, and it is very suitable to be applied to communication systems with severe phase noise such as OFDM digital broadcasting. And because the present invention is simple and easy to implement, it is easy to extend to any order anti-phase noise APSK modulation and demodulation scheme design. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/18H04L27/26H04L1/00
Inventor 徐淑正李阳杨华中
Owner TSINGHUA UNIV
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